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Fri, 10 Nov 2023 19:49:46 GMT Received: from smtpav04.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CA53058054; Fri, 10 Nov 2023 19:49:46 +0000 (GMT) Received: from smtpav04.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 683CE58045; Fri, 10 Nov 2023 19:49:46 +0000 (GMT) Received: from mamboa4.aus.stglabs.ibm.com (unknown [9.3.84.87]) by smtpav04.wdc07v.mail.ibm.com (Postfix) with ESMTP; Fri, 10 Nov 2023 19:49:46 +0000 (GMT) From: Glenn Miles To: qemu-devel@nongnu.org, qemu-ppc@nongnu.org Cc: Glenn Miles , =?utf-8?q?C=C3=A9dric_Le_Goater?= , Nicholas Piggin , =?utf-8?b?RnLDqWTDqXJpYyBCYXJyYXQ=?= Subject: [PATCH v2 4/8] ppc/pnv: Fix PNV I2C invalid status after reset Date: Fri, 10 Nov 2023 13:49:21 -0600 Message-Id: <20231110194925.475909-5-milesg@linux.vnet.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20231110194925.475909-1-milesg@linux.vnet.ibm.com> References: <20231110194925.475909-1-milesg@linux.vnet.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: nTD1h1fM8M0R3G4Je8U-ZuGM8QyNUYU9 X-Proofpoint-ORIG-GUID: 4GMNP_MffUaYJsLbBVjXrjtJXvld-ViL X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-10_17,2023-11-09_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 bulkscore=0 suspectscore=0 mlxlogscore=759 impostorscore=0 adultscore=0 lowpriorityscore=0 phishscore=0 malwarescore=0 mlxscore=0 priorityscore=1501 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311100166 Received-SPF: none client-ip=148.163.158.5; envelope-from=milesg@linux.vnet.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org The PNV I2C Controller was clearing the status register after a reset without repopulating the "upper threshold for I2C ports", "Command Complete" and the SCL/SDA input level fields. Fixed this for resets caused by a system reset as well as from writing to the "Immediate Reset" register. Signed-off-by: Glenn Miles --- hw/ppc/pnv_i2c.c | 42 ++++++++++++++++++------------------------ 1 file changed, 18 insertions(+), 24 deletions(-) diff --git a/hw/ppc/pnv_i2c.c b/hw/ppc/pnv_i2c.c index b2c738da50..f80589157b 100644 --- a/hw/ppc/pnv_i2c.c +++ b/hw/ppc/pnv_i2c.c @@ -462,6 +462,23 @@ static uint64_t pnv_i2c_xscom_read(void *opaque, hwaddr addr, return val; } +static void pnv_i2c_reset(void *dev) +{ + PnvI2C *i2c = PNV_I2C(dev); + + memset(i2c->regs, 0, sizeof(i2c->regs)); + + i2c->regs[I2C_STAT_REG] = + SETFIELD(I2C_STAT_UPPER_THRS, 0ull, i2c->num_busses - 1) | + I2C_STAT_CMD_COMP | I2C_STAT_SCL_INPUT_LEVEL | + I2C_STAT_SDA_INPUT_LEVEL; + i2c->regs[I2C_EXTD_STAT_REG] = + SETFIELD(I2C_EXTD_STAT_FIFO_SIZE, 0ull, PNV_I2C_FIFO_SIZE) | + SETFIELD(I2C_EXTD_STAT_I2C_VERSION, 0ull, 23); /* last version */ + + fifo8_reset(&i2c->fifo); +} + static void pnv_i2c_xscom_write(void *opaque, hwaddr addr, uint64_t val, unsigned size) { @@ -499,16 +516,7 @@ static void pnv_i2c_xscom_write(void *opaque, hwaddr addr, break; case I2C_RESET_I2C_REG: - i2c->regs[I2C_MODE_REG] = 0; - i2c->regs[I2C_CMD_REG] = 0; - i2c->regs[I2C_WATERMARK_REG] = 0; - i2c->regs[I2C_INTR_MASK_REG] = 0; - i2c->regs[I2C_INTR_COND_REG] = 0; - i2c->regs[I2C_INTR_RAW_COND_REG] = 0; - i2c->regs[I2C_STAT_REG] = 0; - i2c->regs[I2C_RESIDUAL_LEN_REG] = 0; - i2c->regs[I2C_EXTD_STAT_REG] &= - (I2C_EXTD_STAT_FIFO_SIZE | I2C_EXTD_STAT_I2C_VERSION); + pnv_i2c_reset(i2c); break; case I2C_RESET_ERRORS: @@ -620,20 +628,6 @@ static int pnv_i2c_dt_xscom(PnvXScomInterface *dev, void *fdt, return 0; } -static void pnv_i2c_reset(void *dev) -{ - PnvI2C *i2c = PNV_I2C(dev); - - memset(i2c->regs, 0, sizeof(i2c->regs)); - - i2c->regs[I2C_STAT_REG] = I2C_STAT_CMD_COMP; - i2c->regs[I2C_EXTD_STAT_REG] = - SETFIELD(I2C_EXTD_STAT_FIFO_SIZE, 0ull, PNV_I2C_FIFO_SIZE) | - SETFIELD(I2C_EXTD_STAT_I2C_VERSION, 0ull, 23); /* last version */ - - fifo8_reset(&i2c->fifo); -} - static void pnv_i2c_realize(DeviceState *dev, Error **errp) { PnvI2C *i2c = PNV_I2C(dev);